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Note 21 - Commitments and Contingent Liabilities (Details Textual) - George Mason Sponsorship [Member] $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)
Termination Option One [Member]
Increase (Decrease) in Contractual Obligation, Termination Option	$ 3.5
Termination Option One [Member] | Minimum [Member]
Contractual Obligation, Option Period	11 years
Termination Option One [Member] | Maximum [Member]
Contractual Obligation, Option Period	15 years
Termination Option Two [Member]
Increase (Decrease) in Contractual Obligation, Termination Option	$ 3.6
Termination Option Two [Member] | Minimum [Member]
Contractual Obligation, Option Period	16 years
Termination Option Two [Member] | Maximum [Member]
Contractual Obligation, Option Period	20 years
Effective June 30, 2025 [Member]
Option to Terminate	10 years
Effective June 30, 2030 [Member]
Option to Terminate	15 years

X

- Definition

Represents the option period for a contractual obligation.

+ References

No definition available.

+ Details

Name:	egbn_ContractualObligationOptionPeriod
Namespace Prefix:	egbn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of increase (decrease) in contractual obligations if the contract is terminated.

+ References

No definition available.

+ Details

Name:	egbn_IncreaseDecreaseInContractualObligationTerminationOption
Namespace Prefix:	egbn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of time, after which, the company has the option to terminate the agreement.

+ References

No definition available.

+ Details

Name:	egbn_OptionToTerminate
Namespace Prefix:	egbn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_GuaranteeObligationsByNatureAxis=egbn_GeorgeMasonSponsorshipMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_OtherCommitmentsAxis=egbn_TerminationOptionOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_OtherCommitmentsAxis=egbn_TerminationOptionTwoMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementScenarioAxis=egbn_EffectiveJune302025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: